linux-kernel - Re: [PATCH RFC V2 17/17] x86/entry: Preserve PKRS MSR across exceptions

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Message-ID: <20200721180134.GB643353@iweiny-DESK2.sc.intel.com>
Date:   Tue, 21 Jul 2020 11:01:34 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH RFC V2 17/17] x86/entry: Preserve PKRS MSR across
 exceptions

On Fri, Jul 17, 2020 at 11:30:41AM +0200, Peter Zijlstra wrote:
> On Fri, Jul 17, 2020 at 12:20:56AM -0700, ira.weiny@...el.com wrote:
> > +static void noinstr idt_save_pkrs(idtentry_state_t state)
> 
> noinstr goes in the same place you would normally put inline, that's
> before the return type, not after it.
>

Sorry about that.  But that does not look to be consistent.

10:57:35 > git grep 'noinstr' arch/x86/entry/common.c
...
arch/x86/entry/common.c:idtentry_state_t noinstr idtentry_enter(struct pt_regs *regs)
arch/x86/entry/common.c:void noinstr idtentry_exit(struct pt_regs *regs, idtentry_state_t state)
arch/x86/entry/common.c:void noinstr idtentry_enter_user(struct pt_regs *regs)
arch/x86/entry/common.c:void noinstr idtentry_exit_user(struct pt_regs *regs)
...

Are the above 'wrong'?  Is it worth me sending a patch?

I've changed my code,
Ira